convert a textview, including those contents off the screen, to bitmap

I want to save(export) contents of MyView, which extends TextView, into a bitmap.

I followed the code: [this][1].

It works fine when the size of the text is small.

But when there are lots of texts, and some of the content is out of the screen, what I got is only what showed in the screen.

Then I add a "layout" in my code:

private class MyView extends TextView{
    public MyView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public Bitmap export(){
        Layout l = getLayout();
        int width = l.getWidth() + getPaddingLeft() + getPaddingRight();
        int height = l.getHeight() + getPaddingTop() + getPaddingBottom();

        Bitmap viewBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(viewBitmap);


        setCursorVisible(false);
        layout(0, 0, width, height);
        draw(canvas);

        setCursorVisible(true);
        return viewBitmap;
    }
}

Now the strange t开发者_StackOverflowhing happened:

The first time I invoke "export"(I use an option key to do that), I got contents only on the screen.

When I invoke "export" again, I got complete contents, including those out of the screen.

Why?

How to "export" a view, including contents cannot be showed on the screen?

Thank you!

[1]: http://www.techjini.com/blog/2010/02/10/quicktip-how-to-convert-a-view-to-an-image-android/ this

I found out a simpler way: Put the TextView in a ScrollView. Now myTextView.draw(canvas) will draw all of the text.

I think you should be subtracting the padding from the width in the height instead of adding it. Adding it will give you an area larger than the screen.

I solved this issue this way(strange but works):

public Bitmap export(){
    //...
    LayoutParams lp = getLayoutParams();
    int old_width = lp.width;
    int old_height = lp.height;
    int old_scroll_x = getScrollX();
    int old_scroll_y = getScrollY();
    lp.width = width;
    lp.height = height;
    layout(0, 0, width, height);
    scrollTo(0, 0);
    draw(canvas);
    lp.width = old_width;
    lp.height = old_height;
    setLayoutParams(lp);
    scrollTo(old_scroll_x, old_scroll_y);
    //...

}